<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 准备好一个“容器” -->
	<div id="test"></div>
	
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        //创建组件
        class Demo extends React.Component {
            /* 
				React.createRef调用后可以返回一个容器，该容器可以存储被ref所标识的节点,该容器是“专人专用”的
			 */
            myRef = React.createRef();
            myRef2 = React.createRef();

            //展示左侧输入框的数据
            showData = () => {
                alert(this.myRef.current.value);
            }

            //展示右侧输入框的数据
            showData2 = () => {
                alert(this.myRef2.current.value);
            }

            render () {
                return (
                    <div>
                        <input ref={this.myRef} type="text" placeholder="点击按钮提示数据"/>&nbsp;
						<button onClick={this.showData}>点我提示左侧的数据</button>&nbsp;
						<input onBlur={this.showData2} ref={this.myRef2} type="text" placeholder="失去焦点提示数据"/>&nbsp;
                    </div>
                )
            }
        }

        //将组件渲染到页面
        ReactDOM.render(<Demo/>, document.getElementById('test'));
    
    </script>
</body>
</html>